Sql on Ravindra Devrani

How to Backup SQL Server Running in Docker on Linux

Mon, 09 Mar 2026 16:08:51 +0530

I am using mssql server in docker container.
I am using vscode extension named SQL Server (mssql) by microsoft. This extension gives you the feature of creating and exporting the backup
Connect to the database. It should look like this:
Create a backup by using that extension.

Note: I have saved backup inside the folder /var/opt/mssql/data/

To find the exact name:

docker exec <container_name> ls /var/opt/mssql/data/*.bak

Copy backup from docker to host machine:

docker cp <container_name>:/var/opt/mssql/data/your_backup.bak ~/Documents/your_backup.bak

How to run Mysql in Docker?

Mon, 22 Dec 2025 18:31:32 +0530

Execute the command below.

For bash:

docker run -d \
 --name mysql-dev \
 -p 3306:3306 \
 -e MYSQL_ROOT_PASSWORD=p@55w0rd \
 -v mysql-data:/var/lib/mysql \
 mysql:8.0.44-debian

For powershell:

docker run -d `
 --name mysql-dev `
 -p 3306:3306 `
 -e MYSQL_ROOT_PASSWORD=p@55w0rd `
 -v mysql-data:/var/lib/mysql `
 mysql:8.0.44-debian

📢 For mac silicon specific:

mysql:8.0.44-debian does not support ARM architectureUse – so use mysql:latest instead of mysql:8.0.44-debian or check official docker hub for suitable image.

How to run Sql Server 2025 in Docker

Thu, 04 Dec 2025 11:00:49 +0530

To be honest, since I have started using docker I have never installed any database in my machine. I use multiple databases and keeping each database up and running takes a toll on resources of your machine. And… you can not install some database like “sql server” on “mac”, then docker is only option for you. Any way, I think it is enough introduction. Let’s get started.

How to run PostgreSql in Docker

Tue, 02 Dec 2025 11:02:49 +0530

Inserting bulk records (1 million) in SQL Server

Wed, 19 Mar 2025 17:25:31 +0530

Creating a database

USE master
GO

DROP DATABASE IF EXISTS BookMillion
GO

CREATE DATABASE BookMillion
GO

USE [BookMillion]
GO

CREATE TABLE [dbo].[Book](
	[Id] [int] IDENTITY(1,1) NOT NULL,
	[Title] [nvarchar](100) NULL,
	[Author] [nvarchar](100) NOT NULL,
	[Country] [nvarchar](100) NULL,
	[ImageLink] [nvarchar](100) NULL,
	[Language] [nvarchar](20) NULL,
	[Link] [nvarchar](200) NULL,
	[Pages] [int] NULL,
	[Year] [int] NULL,
	[Price] [int] NULL

	CONSTRAINT PK_Book_Id PRIMARY KEY (Id)
)
GO

Bulk insert using recursive cte

USE [BookMillion]
GO

WITH Numbers AS (
SELECT 1 AS N
UNION ALL
SELECT N + 1
FROM Numbers
WHERE N < 1000000
)
insert into Book (Title,Author,Country,[Language],ImageLink,Link,Pages,Price,[Year])
select
'Book'+ cast(N as varchar),
'Author'+ cast(N as varchar),
'Country'+ cast(N as varchar),
'Language'+ cast(N as varchar),
'ImageLink'+ cast(N as varchar),
'Link'+ cast(N as varchar),
ABS(CHECKSUM(NEWID())) % 901 + 100, -- Pages between 100-1000
ABS(CHECKSUM(NEWID())) % 901 + 100, -- Price between 100-1000
ABS(CHECKSUM(NEWID())) % 825 + 1200 -- Year between 1200-2024
from Numbers

option (maxrecursion 0)

GO

Covering Indexes In Sql Server

Sat, 01 Mar 2025 15:20:01 +0530

Table structure and total records

Let’s look at our table structure as shown in the left panel of the picture

Note: There is a non-clustered index on the Title column of the Book table, which has a total of 1 million records.

select
 Id,
 Title,
 Author,
 Price
from Book where title='The Divine Comedy'

As you have noticed in the execution plan, there is a key lookup. Since index is only available for the Title column, Title is retrieved from the non-clustered index. However, other columns like Id, Author and Price are not present in the non-clustered index, so they will be retrieved from the clustered index (the Book table). This results in an additional key lookup step and may decrease the performance. It’s like, you are looking for records in two places (non clustered index and clustered index).

What Makes My Query Non Sargable?

Mon, 24 Feb 2025 15:51:23 +0530

A query is SARGable (Search ARGument able) if a database engine can take advantage of index.

What makes a query non SARGable?

These are the few factors that makes a query non sargable.

1. Put a column inside a function in the where clause.

select
 s.SalesOrderID,
 s.SalesPersonID,
 s.OrderDate,
 s.SalesOrderNumber
from Sales.SalesOrderHeader s
where YEAR(s.OrderDate) = 2011; -- Row Retrieved: 1607 and Row read : 31465

Note: I have created covering index on the OrderDate:

SQL Server: Table Scan, Clustured Index Scan, Index Seek, RID Lookup, Key Lookup

Mon, 24 Feb 2025 13:40:51 +0530

Initially, it was not intended to be an article. I was tinkering around sql and documenting few things, then I thought, it could turnout to a nice article. I have wrote lots of article and created lots of videos on c#, .net core and angular. But it is my first article on the SQL.

In this blog post, we are going to explore few terms of execution plan, like table scan, clustered index scan, index seek, RID lookup and key lookup.